CVE-2026-17567
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk31th percentile - higher than 31% of all known CVEs
Summary
The Fluent Forms plugin for WordPress up to version 6.2.8 is vulnerable to Insecure Direct Object Reference (IDOR) via the 'transaction' parameter. Missing validation on a user-controlled key allows unauthenticated attackers to brute-force valid transaction hashes and view sensitive payment receipt data including customer name, email, billing address, order items, payment method, and payment status of other users.
Risk Assessment
An attacker can access sensitive payment data of other users, violating privacy and potentially leading to identity theft or fraud.
Recommendation
Update the Fluent Forms plugin to the latest patched version.
Other vulnerabilities in Fluent Forms
See all- CVE-2026-18146High
The Fluent Forms plugin for WordPress (versions up to 6.2.11) is vulnerable to Stored Cross-Site Scripting via Notification Smartcode Values. Unauthenticated attackers can inject arbitrary web scripts that execute in the browser of an administrator when viewing submission logs. Exploitation requires configured email notifications with attacker-influenced Smartcode values.
- CVE-2026-17571Medium
The Fluent Forms plugin for WordPress up to version 6.2.8 contains a Reflected Cross-Site Scripting (XSS) vulnerability via the 'param' parameter. Unauthenticated attackers can inject arbitrary web scripts that execute if they trick a user into clicking a link.
- CVE-2026-11881Medium
The Fluent Forms WordPress plugin before 6.2.6 does not sanitize and escape one of its form field configuration settings before outputting it inside an inline script when a form is rendered. Users with a role as low as Contributor (with delegated form-management permission, but lacking unfiltered_html, e.g., in a multisite setup) can perform Stored Cross-Site Scripting attacks that execute in the browser of any visitor who loads the form, including administrators previewing it.
- CVE-2026-16655High
The Fluent Forms plugin for WordPress up to version 6.2.7 has a Stored XSS vulnerability via the Name field nested in `password`. An unauthenticated attacker can inject arbitrary JavaScript that executes when a user views the page.
- CVE-2026-5069Medium
The Fluent Forms plugin for WordPress up to version 6.2.1 contains an incorrect authorization vulnerability in the 'subscription_id' parameter. Insufficient ownership checks in the AJAX payment cancellation flow allow authenticated attackers with subscriber-level access or higher to cancel other users' subscriptions.
- CVE-2026-11578Low
The Fluent Forms WordPress plugin before version 6.2.5 does not properly restrict the deletion of form submission entries to the forms a restricted Manager is authorized to manage. This allows a Manager limited to specific forms to permanently delete submission entries belonging to other forms. This requires a non-default configuration where an administrator has created at least one Manager restricted to specific forms.
- CVE-2026-11880Low
The Fluent Forms WordPress plugin before version 6.2.1 does not properly verify ownership before processing a subscription cancellation request, allowing authenticated users with low privileges to cancel subscriptions belonging to other users.
Original NVD description (English source)
The Fluent Forms – Customizable Contact Forms, Survey, Quiz, & Conversational Form Builder plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 6.2.8 via the 'transaction' parameter due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to brute-force valid transaction hashes and view sensitive payment receipt data including customer name, email address, billing address, order items, payment method, and payment status belonging to other users. Because submission ID, form ID, and transaction creation time are either observable or guessable by an attacker, the effective brute-force space is bounded to approximately 900 candidates per second per (submission, form) pair, making exploitation practical without any prior authentication or account.